Aug 03, 2016 the design steps have been presented in the following question how do i degisn two way slab. Best practices of concrete pavement transition design and construction by youn su jung graduate assistant research texas transportation institute dan g. The codes governing the design of the one way slab will be aci 31802 and ibc 2003. All methods are viable provided that the safety and serviceability of the elements are within the acceptable limits. Analysis and design of slabs two way two way edge supported slabs two way slabs. The following example illustrates the example building. The design shear force of twoway restrained slab can be calculated as follows. In two way slab, the ratio of longer span l to shorter span b is less than 2. In most cases, the slab thickness is designed as an unreinforced concrete section. Posttensioned oneway slab pennsylvania state university.
Example design of two way edgesupported solid slab. Unless otherwise noted, all referenced table, figure, and equation numbers are from these books. Waffle slab analysis and design is similar to the procedure used with flat plates except that special considerations need to be taken into account to reduce the complexity of calculations needed when. Please read the lauses mentioned in the video while solving the problem. Slab is one of the most famous part of a construction project. Multi storey, post tension, two way, design, comparison. From the study it is considered that post tension slab is more economical than two way slab. Twoway slab design based on aci 31811 using finite element method. Accordingly, main reinforcement is required in the two directions. Example design combinations for deflection quasipermanent derived for typical uk.
Design of twoway slab by coefficient method the constructor. Analysis of two way ribbed and waffle slabs with hidden beams. Rectangular beams and one way slabs page 2 of 9 two methods. This method requires various formulas for different conditions of rc slab. One way and two way slabs one way slabs transfer the imposed loads in one direction only.
Design of a two way rcc slab structural engineering. Design of a two way rcc slab structural engineering forum. Shear force at short span, shear force at long span, where. Pdf analysis of two way ribbed and waffle slabs with.
Design of reinforced concrete structures ii twoway slabs 1 1. Uniformly distributed load was considered, that represent almost practical cases. Time saving design aids twoway slabs page 1 of 14 the following example illustrates the design methods presented in the article timesaving design aids for reinforced concrete, part 2. Jul 22, 2015 design of two way ribbed slab 18 x 25 m clear span 1. The coefficient method may be the simplest, easiest and the quickest approach for the design of two way slab supported by edge beam on all slab sides. Twoway concrete floor slab with beams design and detailing csa a23. Oneway and twoway slabs oneway slabs transfer the imposed. One way spanning slabs should be treated as beams of unit width and chapter 2 should be followed except for minimum shear reinforcement. Tn342 design example 2way mondada 093090 adapt corporation. The owcs was able to be integrated with the existing architectural design with minor architectural impact. Here is two way rcc slab designing excel sheet template for download. Standard deviation for compressive strength of concrete with example pdf. Foreword the reinforced concrete design manual sp1711 is intended to provide guidance and assistance to professionals engaged in the design of castinplace reinforced concrete structures. Slabs are generally designed on the assumption that they consists of a number of beams of breadth one meter.
The slab is supported on beams of size 225 x 500 mm spaced at 4. Twoway slab analysis and design using equivalent frame method efm. However, plastic method can be the best method for designing such cases of two way slabs. Design of reinforced concrete structures ii two way slabs 1 1. Floor slab design floors are designed as slabs on grade. The redesign of the residences compared a two way concrete slab twcs design to a one way concrete slab owcs design. Twoway slab example 1 beam structure classical mechanics. Design procedure steps for one way slab slab design steps. A slab is a concrete structure constructed to provide a flat surface. It can be used by both practicing engineers and students. What are the difference between tender and contract documents.
For economical design of similar structures a smaller slab thickness leading to values between 60% to 80% of balanced selfweight is generally selected. Fanella, which appeared in the october 2001 edition of structural engineer magazine. We know, one way slabs are designed to transfer their loads to only two opposite support walls. Aci318 code provides two design procedures for slab systems. The slab thickness depends on the type of loads on the floor slab. There are several methods by which twoway slabs can be designed. Download our free two way slab design spreadsheet only from samotech. Consequently, aci 360 was formed with this mission. Two way slab design based on aci 31811 using finite element method. Framing dead load selfweight superrimposed dead load 25 psf partitions, me, misc. For those who do not know what are the des ign requirements of a slab.
There are several methods by which two way slabs can be designed. Member design reinforced concrete two way spanning. Pdf design of reinforced concrete circular slabs by twoway. This paper focuses on analysis of two way ribbed and waffle slabs with hidden beams. Design of a two way slabs for punching shear resistance. Bending will take place in the two directions in a dishlike form. A monolithic reinforced concrete floor is to be composed of rectangular bays measuring, as shown. In a oneway spanning slab the area of each bay exceeds 30 m2. View test prep concrete 3 design of concrete beam and slab two way slab part 2 2 from engineerin 101 at royal melbourne institute of technology. Flat plate concrete floor system does not use beams between columns or.
Continuous one way slab figure 1 shows a clear area of 12 m x 8. Concrete 3 design of concrete beam and slab twoway. Twoway joist waffle slab design approach and methodology. This condition occur when the slabs are connected monolithically with support. Twoway slabs structural engineering forum of india, sefi. Plan view of floor system assume partitions will not be damaged by deflections. No redistribution is allowed when method 1 or method 2 of analysis in section 3. A simplified method for designing rc slabs under concentrated. Member design reinforced concrete two way spanning slab bs8110 v2015.
In this video deisgn of two way slabs has been covered using is 456. Two way joist slab often called two way ribbed slab or waffle slab is an economical floor system when the spans are long andor loads are high. The basic design procedure of a twoway slab system has five steps. Reinforced concrete design 1 design of slab examples and. Oneway and twoway slabs university of asia pacific. Bending will take place in the two directions in a dishlike fo. The best flat slab analysis, design and detailing related pdf and slides are provided here altogether. Slabs can be designed by direct design method known as ddm and another method for design is coefficient method which is the easier one. Best practices of concrete pavement transition design and. The other ways of analysis of twoway slabs are the direct design method and the equivalent frame method.
I have developed a microssoft excel software for design of a two way rcc slab. How to design a twoway slab free download as powerpoint presentation. The specified design strength of the concrete, is 25 mpa and the specified yield strength of the reinforcement, fy, is 400 mpa. Oneway slabs transfer the imposed loads in one direction only. Two way slab design based on aci 31811 using finite element method the slab is designed as two way when the ratio of long span to short span is less than 2, then the slab is known as a slab spanning in two directions or two way slab. Design of slabs on grade aci committee was specifically charged to cover design. Two way reinforced concrete slab design spreadsheet working. Two way slab design by direct design method as per aci 31811, step by step procedure and limitations of direct design method for two way slab is presented. Chapter 3 design of rectangular beams and oneway slabs 12. Useful illustration example is presented in this study according. Reinforcing is added to control shrinkage cracking and maximize the distance between. How to design concrete structures using eurocode 2. When a rectangular slab is supported on all the sides and the lengthtobreadth ratio is less than two, it is considered to be a two way slab. I am submitting it to you and i want students or professional engineers to download it and use it for their studies or projects.
Panel edge conditions analysis and design of slabs two way. The following example illustrates the design methods presented in aci 31805 and ibc 2003. Static equilibrium of two way slabs total moment in both beams full load was transferred eastwest by the planks and then was transferred northsouth by the beams. Only external walls 230 mm thick with 12 mm plaster on both sides are considered. Difference between one way slab and two way slab system. In the design of concrete slabs with openings the building codes propose.
Two way reinforced concrete slab design spreadsheet working stress design coefficient method. Chapter 3 design of rectangular beams and oneway slabs. Reinforced concrete design 1 design of slab examples. Two way flat plate concrete floor system analysis and design the concrete floor slab system shown below is for an intermediate floor to be designed considering partition weight 20 psf, and unfactored live load 40 psf. Concrete 3 design of concrete beam and slab twoway slab. Design of slabtwo way excel sheet online civilforum. Allowable stress design or working stress design wsd 2. The slab panel is part of the suspended floor slab and so the upper and lower surfaces of the slab are interior for durability cover and crack control purposes. Here are the steps for the design procedure for one way slab in steps.
Beams of width and depth are provided on all column lines. Two way slab is a slab supported by beams on all the four sides and the loads are carried by the supports along both directions, it is known as two way slab. There are many methods that are used to analyze two way slabs and the precision of these methods vary depending. Strength design or ultimatestrength design usd strength design or ultimatestrength design usd with strength design method, the working dead load dl and live load ll are. Pdf slabs are the flooring systems of most structures including office. Contains all design checks required by the american concrete institute code and all the conditions that must be met during the design process. Distribute moments transverse at critical sections to column and middlestrip and if. The committee is also aware of projects on which design professionals have specified temperature tendons between the bands in two way posttensioned slabs.
Design of slab examples and tutorials by sharifah maszura syed mohsin example 2. Before you start, you must be familiar with your operating system. Estimates in building construction sample spreadsheet. Two way restrained slab if the slabs consist more than one panel or corner of the slab are prevent against lifting it is define as two way restrained slab. Develop and report on criteria for design of slabs on grade, except highway and airport pavements 1. The proposed slab system must be able to be constructed at a reasonable cost.
The first reinforced concrete design manual formerly titled aci design handbook was developed in accordance with the design provisions of 1963 aci 318 building code by aci committee 340, design. Flat slab analysis, design and detailing pdf civil. If the ratio of longer dimension of the slab panel to the shorter dimension is greater than or equal to 2 then it is designed as one way slab. Generally, there are two types of slab which are one way and two way slabs. Twoway concrete slab with beams spanning between supports.
Jul 10, 2017 this example goes through the design of a simplysupported one way slab on beams. No certain method can be found in the design codes or references for designing two way slabs subjected to concentrated loads. Two way slab design spreadsheet the engineering community. Twoway flat plate concrete floor system analysis and design the concrete floor slab system shown below is for an intermediate floor to be designed considering partition weight 20 psf, and unfactored live load 40 psf.
Zollinger program manager, rigid pavements texas transportation institute and shiraz d. Load paths, one and two way slabs structural concepts and design duration. One way concrete slab design part 2 area of tension steel canadian code duration. The rcc slab designing tool is developed by shankar toyal, student of indian institute of technology, bhubaneswar. Analysis and design for main block is to be performed. The solution per ddm can be found in the twoway plate concrete floor system design example. Analysis and design of two way slabs page 4 simple beam, uniformly loaded by its share of q. Analysis and design of slabs two way civil engineers pk. The following example illustrates the design methods presented in the pca book. In two way slabs, load will be carried in both the directions.
The unit weight of reinforced concrete is assumed to be 24 knm3. In case of one ways slabs, the aci approximate analysis is applicable to one way slab system where a one way slab is continuous with a one way slab. Download two way rcc slab designing excel sheet template. Step 2 design forces draw panel of slab and indicate maximum design moments, shears and in plane loads, if any, per unit width of slab. Design of concrete structures as easy as possible by. The proposed slab system must meet the current code. Tayabji regional manager ctl group report 053201 project 05320. Two way concrete floor slab with beams design and detailing design the slab system shown in figure 1 for an intermediate floor where the story height 12 ft, column crosssectional dimensions 18 in. Time saving design aids two way slabs page 1 of 14 the following example illustrates the design methods presented in the article timesaving design aids for reinforced concrete, part 2. When the ratio of long span to short span is less than 2, then the slab is known as a slab spanning in two directions or two way slab. Shrinkage and temperature reinforcement in twoway post. View test prep concrete 3 design of concrete beam and slab twoway slab part 22 from engineerin 101 at royal melbourne institute of technology. The first reinforced concrete design manual formerly titled aci design handbook was developed in.
How to design a two way slab free download as powerpoint presentation. The same is true for a two way slab or any other floor system. This document was uploaded by user and they confirmed that they have the. Assume partitions cannot be damaged by deflections. Design criteria there are three criteria which must be considered for the design of a conventional one way slab system. So, main reinforcement is provided in both direction for two way slabs. Use i wsd, ii usd to design the twoway slab shown below, carrying floor finish 30 psf, random wall 50 psf and live load 60 psf given. Two way slabs have two way bending unlike one way slab. Two way slab design by direct design method as per aci 31811.
He developed a project economic design of two way rcc slabs and this slab designing excel is a part of his project. The slab thickness for the owcs was determined to be 5 and was 10 for the twcs. Download two way slab design excel sheet template for free. This spreadsheet performs an analysis and design of two way spanning reinforced concrete slab. Abstractdesigning two way slabs under transverse concentrated loads is one of the challenges in designing such structures.
Slab resting on walls or sufficiently deep and rigid beams on all sides. The slab is to be designed as a reinforced concrete two way slab supported on beams. Determine moments at critical sections in each direction, normally the negative moments at supports and positive moment near midspan. The example presented here is for twoway posttensioned design. The reinforced concrete design manual sp1711 is intended to provide guidance and assistance to professionals engaged in the design of castinplace reinforced concrete structures. They may be supported on two opposite sides only fig. Ce 433, fall 2006 slab design example 1 6 design a oneway slab for an exterior bay of a multistory office building using the information specified below. Two way concrete slabs with openings experiments, finite element analyses and design piotr rusinowski. Twoway slab design based on aci 31811 using finite. But when lb 2 two opposite support walls cant take the load,so a criteria is required to transfer the load to four supporting walls. Basic steps in two way slab design choose layout and type of slab.
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